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UPnP doesn't leave your local network, so no. You cannot forward ports at all behind CGNAT.
by ianlevesque 14y ago
UPnP doesn't leave your local network, so no. You cannot forward ports at all behind CGNAT.
- Sami_Lehtinen 14y agoWell, in case of CGNAT is run (naturally) by the ISP, and network connection from that point is bridged. So yes, I think UPnP will reach their system. If they just want to honor it. Maybe with very restricted port number ranges / portscustomer IP or so. If they have smart mapping system, they can map customers even to multiple IP's so that everyone really needing to open specified port can actually do, because I'm sure they'll NAT to range of public IPs.
- trotsky 14y agoYou misunderstand CGN deployments - there are still different address spaces on either side of the customer router. It's just now both of them are private/non routable prefixes, or in some cases the telco side is done using six. There's no briding and UPNP will never work - once you are on CGN data paths have to be set up from the customer side.